Method of inserting bristles in rubber pads



June 17 1924.

M. VIDAVER METHOD OF mssx'rme BaIsrrLEs m RUBBER PADS Filed Jan. 8. 1920 2 Sheets-Sheet 1 a lwslvron ATTORNEY June 17 1924.

M. VIDAVER METHOD OF INSERTING an ISTLES IN RUBBER PADS 2 Sheets-Sheet 2 File d Jan.f8, 1920 O O O O O O O O OOOOQOOOO A TTOR/VEY Patented June 17, 192.4.

UNITED STATES MAXWELL VIDAV'ER, OF NEW YORK, N. 'Y.

rrnrrron or INSERTING 'enrsrnns IN unseen PAZDS.

Application filed January 8, 1920. Serial No. 350,176.

To all whom it may 6.071067 Be it known that I, MAXWELL Vrngvnn, a citizen of the United States, and a resident of New York, in the county of New York 6 and State of New York, have invented certain new and useful Improvements in a Method of Inserting Bristles in Rubber Pads, of which the following is a specifica tion.

The present invention relates to the manufacture of brushes having bristle-supporting rubber pads. These pads are provided with perforations, into each of which either a single or agroup of bristles is inserted,

1 the inner endsof the bristles being provid-' ed with heads or offsets, which are covered in some suitable manner with a back sheet,

whereby the bristles arepermanently mounted in the rubber pad. The most ,diflicult operation in manufacturingv these brushes,

which are usually hair brushes, consists in the mounting of bristles in the rubber pad,

andis due to the fact that the number of bristles to be mounted is very high, and that 2 they are disposed'inclose vicinity of each other. I

The main object ofthe present invention is to provide a method of mounting bristles on rubber pads, which overcomes the difficulties above referred to .in that it is entirely independent of the number of bristles to be inserted and also of the distance at which they are to be mountedin relationto each other.

Another object of the invention is to sim-v plify and cheapen the operation of inserting the bristles in the rubber pads.

Two of the many possible apparatus for carrying out the method forming the sub ject matter of the present application for Letters Patent are illustratedin the accompanying drawings, in which Figure 1 is a plan view of a rubber pad, to which the bristles are to be attached; Fig. 2 is a central vertical section taken through part of the apparatus for carryingout the method; Fig. 3 is a similar section of a -portion of the said apparatus, on a larger scale; Fig. 4 is a central Vertical section taken I through a combined perforating and guide member, through which the bristles are in seduc te th ru e Pa i 5 is a plan ViE o u ber padpe to ated ar 'parat ory to having the bristles inserted therein Fig. 6 is a viewsimilar to the one shown in Fig. 2 of modified apparatus; Fig.

7 is a section of a portion of the apparatus shown in Fig. 6, on a larger scale; and Fig. 8 1s a vertical section taken through a tub'u-. lar body, through which the bristles are guided into the perforations in the rubber pad shown in Fig. 5 of the drawings.

Generally speaking, the improved method of inserting bristles in rubber pads consists in perforating the pad, stretching the material surrounding the perforations in the pad so as to enlarge theperforations, inserting then one or more bristles within the perforthey correspond to the location of the bristle receiving perforations to be made in the rubber pad. The means for perforating the rubber pad comprises a plurality of Verti cally arranged tubular members 16, the upper ends of whichare attached to and arranged in the holes'of a frame 17, while their lower ends are provided with piercing points 18. The frame 17, with the tubular members 16 thereon, is reciprocable in relation to the block 10, it being guided in its movement in any suitable manner, for in' stance by frame sections 19 of the apparatus. Suitable means must, of course,'be provided for bringing the block and the elements thereon in proper relation to the said tubular members.

The manner in which the apparatus is used in inserting bristles infrubber pads in accordance with the method herein described is as follows :The rubber pad is placed into the recess of the block 10, and the. guide plate 13 superimposed upon the said pad. The elements are then put upon a support Y10 and brought intooperativ'e relation to the frame 17.- This frarne is then lowered, whereby the tubular members 16 thereon are caused to pass through the perforations 14 in the guide plate 18 and perforate the rubber pad. These perforations are enlarged, as the said tubular members complete their downward movement. One or a group of bristles is fed either before or after the perforating operation into each tures therein to contract and closely engage the respective bristles as soon as the tubular members 16 have been disengaged therefrom.

The block and the guide plate 13 are then disengaged from the rubber pad and the bristles thereon, and the bristles cemented or otherwise attached to the said pad, to be placed. finally upon a wooden or other brush-back.

As appears from the foregoing, the per forating and stretching operations are performed by the same mechanism, that is to say by the tubular members 16, their piercing points 18 first perforating the pad and their body portions then enlarging the said perforations.

It is obvious that the rubber pads may be perforated on a separate machine and the perforations then enlarged on the bristle-inserting device. A device of this type is shown in Figs. 6 to 8, inclusive, differing from the one abovedescribed in that the tubular members 16 lack the piercing points. In this instance the rubber pad 12 is provided with perforations 12 before it is put in the recess of the block 10. The diameters of the perforations 12 are of course somewhat smaller than the diameters of the bristles. As the tubular members are forced through the perforations 12", the yielding nature of the rubber permits the perforations to be temporarily enlarged for the purpose above set forth. Otherwise the method. is carried out in the manner de scribed in connectionwith the device shown in Figs. 2 to 4, inclusive. 7 7

What I claim is I 1. The method 'of mounting bristles on rubber pads,.which consists in perforating the pad, temporarily enlarging the perforations, inserting one or more bristles within each "perforation out of contact with the walls thereof, and then permitting the material of the pad to contract upon the in serted bristles.

2. The method of mounting bristles on rubber pads, which consists in perforating the pad, employing an enlarging means to temporarily enlarge the perforations, iii- 7 serting one or more bristles'in each perforation, the enlarging means preventing contact between the bristles and the pad, and then withdrawing the enlargingmeans from the perforations and thereby permitting the material of the pad to contract upon the inserted bristles. V

3. That improvement in the art of inserting bristles in an apertured elastic pad which consists in supporting the pad on one side with a plate provided with an opening opposite the aperture in the pad; inserting into the aperture in the pad from its other side a bristle guiding tube, larger than said aperture, whereby said aperture is expanded,- and one or more bristles .within said tube, and then withdrawing the tube leaving the bristle inserted in the aperturein' the pad, and permitting the material of the pad to contract upon said inserted bristles.

4. That improvement in the art of inserting bristles in a rubber pad which consists in confining the pad between two plates, one provided with a perforation and the other with an opening opposite said perforation,

in providing the rubber pad with a perforation, confining the pad between two plates, one provided with a perforation registering with the perforation in the pad, and the other with an opening opposite said regisrubber pad, and inserting through said perforations in the one plate and the pad into the opening in the other plate, a bristleguiding tube and one or more bristles protected by the tube from contact with the walls of the perforation in the rubber pad, and then withdrawing the tube leaving the bristle inserted in the perforation in the rubber pad. p 7

6. That improvement in the art of inserting bristles in a perforated soft-rubber pad which consists in stretching the material surrounding a perforation inthe pad to enlarge said perforation, inserting one or more bristles within said perforation, and then permitting the material of the pad to contract upon the inserted bristle or bristles.

7. That improvement in the art of insert- .ing bristles ina rubber pad which consists tering perforations in the one plate and the ing bristles in a perforated rubber pad, in the pad, and then Withdrawing said tube which consists in forcing through said perpermitting the material of the pad to conforation a bristle-guiding tube larger than tract upon the inserted bristle or bristles. 1 the perforation thereby stretching the ma- Signed at New York, in the county of 5 terial of the pad surrounding the perfore- New York and State of New York, this 2nd tion, inserting one or more bristles through day of January, 1920. said tube so inserted through said aperture MAXWELL VIDAVER. 

